What is the name of the space located between waste water pipes and floor drains?

The answer to this question is GAP.

Floor drains are plumbing fixtures that is installed in the floor to remove the water that is surrounding the floor. Water pipes are plumbing fixtures that is installed where water flows in it. Gap is the space between the water pipe and the floor drain. 

the excerpt from chapter 2 of "animal farm", by george orwell that is an example of foreshadowing is "these three (snowball, napoleon, and squealer) had elaborated old major's teachings into a complete system of thought to which they gave the name of animalism." animal farm is an allegory of how czarist russia developed into communist russia with all its corruption. old major's teachings represent marx's theories turned into communism, animalism, by the three pigs. this foreshadows the oppression and corruption that will follow this revolt.